Edwin fbanklin williams



(No Model.)

E. F. WILLIAMS.

INER'I'IA` RECORDING MBGHANISM POR STEAMVBNGINES. 10.307,612.

Patented Nov. 4

lUNiTnD STATES PATENT Ottica EDW'IN FRANKLIN W'ILLIAMS, OF PHILADELPHIA, PA., ASSIGNOR TO THE CROSBY STEAM GAGE AN D VALVE COMPANY, OF BOSTON, MASS.

INERTIA==RECORDING MECHANISM FOR STEAM-ENGlNES.

SPECIFICATION forming partici Letters Patent No. 307,612, dated November 4, 1881i.

.v\. pplieatimi filed May Q6, ll.

To all who/it it may concern:

Be it kn own that I, EDWIN Fnxxxmx WinL- IriMs, of Philadelphia, in the county of Philadelphia, ot' the State of Pennsylvania, have invented a new and useful Improvement in Inertia-Recording Mechanism, such being for indicating the inertia ot' moving parts of a steanrengi ne, and I do hereby declare the same to be described in the 'following specification and represented in the accompanying drawings, ot' which- Figurel is a top view, Fig. 2 a front elevation, and Fig. 3 a longitudinal section, of an inertia indicator or register containing my invention, the nature ot' which is delined in the claim hereinafter presented.

The reciprocating parts of a steanrcngine are put in motion and theoreticallyT brought to rest twice for every revolution ot' the crank, and there is due to this acceleration and retardation a certain inertia i'oree,which the indicator or register hereinbel'ore described is intended to measure. It does not indicate the actual forces ot' the reciprocating parts, but the force exerted by a known weight whose movements are coincident with those ofthe piston of the engine or with those ot' some other part or parts having correslionding movements. The actual force or inertia ot' this known weight is at any part ot' the stroke of the piston recorded upon paper by a pencil actuated by the weight-in other words,there is drawnadiagram fromor by which theiorces of inertia throughout the said stroke, or at any point thereof, may be measured or determined, the paper being properly scaled to indicate by the diagram the inertia forces. The proportion the indicator movable weight bears to that of the weight of the part or parts whose forces of inertia it may be desirable to ascertain being known, it becomes an easy matter to determine such forces, for the inertia of the weight indicated by the extent of movement of the pencil away from a neutral line is te the inertia of the reciprocating parts of the engine as the weight of the weight is to that of such reciprocating parts. Therefore, if these weights are in the proportion of one to twenty, and the movement f the pencil away from the (No model.)

neutral line be one inch, for instance, for an 5o inertia force of five hundred pounds ol"l the weight, we shall know that such a movement ofthe pencil will indicate tcn thousand pounds as the measure ot the inertia ot' the reciprocating parts of the engine. There being on the paper a proper scale to indicate any such movement of the pencil, the amount ot' inertia ot' the weight due to any degree ci' movement ot' the pencil will be to the ive hundred pounds as the degree ot' movement ofthe pen- 6o cil is to one inch. From this it will be seen that bythe curved line traced by the pencil on the paper we can ascertain the inertia i'orces of the reciprocating parts oi' the engine at any part or parts ofthe stroke.

In the drawings, A denotes an arm l'or supporting the operative parts ol" the indicator. There projects from the arm a case, I5,\vitl1in which is a cylindrical weight, C, which is adapted to slide lengthwise within the ease. 7o A spiral spring, D, arranged within a chamber in the weight, is attached at one end oi it to the weight and at the opposite end to the case. A spindle or rod, E, iixed to the weight, extends through the spring and the case and the arm A, and is jointed to the shorter arm ot' abent lever, F,which, as shown at fr in Fig.

1, is fulcrumed to a bracket, a, extending from the arm A. At or near the outer end ot' the longer arm of the lever F there is attached to 8O the lever a pencil or marker, l), that is directly over a curved plate, G. This plate is supported by a long or pendulous lever, II, which at its lower part is jointed to the arm A. The plate G is curved with a radius whose center is in the axis of thejoint-pin c of the lever H. The said plate G is iixed to the said lever H, so as to be incapable ot' any movement relatively thereto, except a short one either toward or away from the pencil, there being atgo tached to the plate a cord, cl, that passes upward through a sheave, c, close to the i'ulcrum f ot' the lever H. In practice the said lever H is fulcrumed to some suitable device that will allow the lever to swing with a pendnlous motion when the arm A is reciprocated rectilinearly with and by the piston, such arm A, when the instrument is in use, being attached to the cross-head of the piston. As the piston may reciproeate,the arm A and the weight C will move forward and backward with it, the :inertia of such weight causing the weight to move in the case B, and to be controlled in such movement by the spring` D. ln each movement tl'ieweight will carry the spindle with it and move the lever F. As the lever H will be swung by the arm A, the plate G will be reeiprocated or have endwise movements imparted to it,wl1ereby when a sheet of paper is tixed ou the said plate G and the point ofthe pencil is in Contact with such sheet a line generally more or less curved will be drawn on the sheet during,` the stroke ol" the piston. By pulling upward the cord d, the plate can be drawn upward to cause the paper to collie into Contact with the peneil when it may be desirable to have the latter marl; the paper., The curved line so made will serve,

as liereinbef'ore described, to register or indicate the forces ol" inertia of the reciprocating,` parts ofthe engine.

It will be evident that the curved plate Gr may be fastened to the lever ll, so as to be immovable up and down relativelyto the pencil; but it is preferable to have the plate so movable and to be provided with the cord, as described, to raise it.

l claim- The inertia-imlicator, substantially as described, Consisting oi' the arm A, caseB,\veiglit C, spring D, spindle E, le\f'e1l `,(piovided with the pencil 1),) curved plate G, and its Carryinglever H, combined essentially and to operare and for the purpose as set forth.

EDW'lN F {ANKLIN VILLIAMS.

Witnesses:

R. H. EDDY, E. B. PRATT. 

